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Basic Concepts of Chemistry
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Basic Concepts of Chemistry
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25 Questions

1. Number of moles of MnO4 required tooxidize one mole of ferrous oxalate completelyin acidic medium will be: [2008]
2. One litre hard water contains 12.00 mg Mg 2+.Mili-equivalents of washing soda required toremove its hardness is: [1988]
3. The number of oxygen atoms in 4.4 g of CO 2 is[1990]
4. Percentage of Se in peroxidase anhydraseenzyme is %0.5 by weight (atwt= )78.4 thenminimum molecular weight of peroxidaseanhydrase enzyme is [2001]
5. litres nitrogen - 1520 litres nitrogen - 2025 litres nitrogen - 1510 litres nitrogen - 3027The maximum number of molecules ispresent in [2004]
6. What is the weight of oxygen required for thecomplete combustion of 2.8 kg of ethylene?[1989]
7. The number of moles of KMnO4 reduced byone mole of KIin alkaline medium is: [2005]
8. If N A is Avogadro-™s number then number ofvalence electrons in 4.2g of nitride ions (N 3-“ ) is[1994]
9. Which has the maximum number ofmolecules among the following? [2011]
10. Which has maximum number of molecules?[2003]
11. At S.T.P the density of CCl 4 vapours in g/Lwillbe nearest to: [1988]
12. An element - Xhas the following isotopiccomposition: 200X: 199 %90X: 202 %8.0X: %2.0 Theweighted average atomic mass of the naturallyoccuring element Xis closest to [2007]
13. Concentrated aqueous sulphuric acid is %98H2 SO4 by mass and has a density of 1.80 g mL -“ 1.Volume of acid required to make one litre of0.1MH2 SO4 solution is [2007]
14. Boron has two stable isotopes - 10B (19%) and11B (81%)Average atomic weight for boron inthe periodic table is [1990]
15. What volume of oxygen gas (O2) measuredat °0 C and 1 atm - is needed to burn completely1L of propane gas (C 3H8) measured under thesame conditions? [2008]
16. The mass of carbon anode consumed(giving only carbondioxide) in the production of270 kg of aluminium metal from bauxite by theHall process is (Atomic mass: Al = )27 [2005]
17. The number of atoms in 0.1 mol of atriatomic gas is: (N A= 6.02 ×1023 mol-“ )1 [2010]
18. In Haber process 30 litres of dihydrogenand 30 litres of dinitrogen were taken forreaction which yielded only %50 of the expectedproductWhat will be the composition ofgaseous mixture under the aforesaid conditionin the end? [2004]
19. An organic compound containing C - HandOgave on analysis C-“ %40 and H -“ .%6.66Itsempirical formula would be [1999 - 94]
20. In an experiment it showed that 10 mLof0.05 Msolution of chloride required 0 mLof 0.1Msolution of AgNO3 - which of the following willbe the formula of the chloride (Xstands for thesymbol of the element other than chlorine):[2013]
21. The number of significant figures for thethree numbers 161 cm - 0.161 cm - 0.0161 cm are[1998]
22. The molecular weight of O2 and SO2 are 32and 64 respectivelyAt 15°Cand 150 mm Hgpressure - one litre of O2 contains -˜N-™ molecules.The number of molecules in two litres of SO 2under the same conditions of temperature andpressure will be: [1990]
23. Specific volume of cylindrical virus particleis 6.02 × 10-“2 cc/gmwhose radius and length 7Ã…& 10 A respectivelyIf NA= 6.02 × 1023 - findmolecular weight of virus [2001]
24. Volume occupied by one molecule of water(density = 1 g cm-“)3 is: [2008]
25. What is the [OH -“ ] in the final solutionprepared by mixing 20.0 mLof 0.050 MHCl with30.0 mLof 0.10 MBa(OH) 2? [2009]

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